Apologies. I forgot that I disabled the reference qualifier on the type field to show all fields while doing some development earlier.
NOTE: Do not capture this in an update set! Set your application to Global and update set to Default when doing these next steps!
Right click on the Type field and select Configure Dictionary.
Go to the Reference Specification section and set the "Use Reference Qualifier" field to "Simple"
Save the Record
Now you can select HTML Script (and other types of fields)